Fixed PHP warning if JSON configuration is unreadable or empty. Fixes #3
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@ -84,7 +84,7 @@ To test your XPath expressions, you can use these Chrome extensions:
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Some XPath expressions you could need (the `//` is automatically prepended and must be omitted in the FeedMod configuration):
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##### HTML5 <article> tag
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##### HTML5 <article> tag
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```html
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<article>…article…</article>
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